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Backscattering spectroscopic contrast with angle-resolved optical coherence tomography.

Adrien E Desjardins1, Benjamin J Vakoc, Guillermo J Tearney

  • 1Harvard Medical School and Wellman Center for Photomedicine, Massachusetts General Hospital, Boston 02114, USA. adesjard@MIT.edu

Optics Letters
|November 3, 2007
PubMed
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Angle-resolved optical coherence tomography (OCT) reveals subwavelength scatterer diameters by analyzing wavelength-dependent backscattering. This technique accurately differentiates microsphere sizes, consistent with Mie theory, even with high speckle noise.

Area of Science:

  • Biomedical Optics
  • Optical Imaging
  • Spectroscopy

Background:

  • Optical Coherence Tomography (OCT) is a non-invasive imaging modality.
  • Characterizing microscopic structures is crucial for biological and material sciences.
  • Subwavelength resolution imaging remains a challenge in optical techniques.

Purpose of the Study:

  • To demonstrate backscattering spectroscopic contrast using angle-resolved OCT for subwavelength scatterer diameter determination.
  • To validate the capability of the technique in resolving differences in microsphere sizes.
  • To assess the impact of speckle noise reduction on spectral differentiation.

Main Methods:

  • Utilized angle-resolved optical coherence tomography (OCT) with a wavelength-swept laser at 1295 nm.

Related Experiment Videos

  • Applied spectroscopic digital processing algorithms to frequency-domain interferograms.
  • Employed angular compounding for speckle noise reduction.
  • Compared experimental backscattering spectra with Mie theory predictions.

    • Main Results:

    • Successfully determined scatterer diameter with subwavelength resolution.
    • Clearly resolved wavelength-dependent backscattering differences between 0.3 and 1 micrometer diameter microspheres.
    • Observed backscattering spectra showed consistency with Mie theory.
    • Angular compounding significantly reduced speckle noise, enhancing spatial resolution for spectral differentiation.

    Conclusions:

    • Angle-resolved OCT with backscattering spectroscopy is a powerful tool for subwavelength scatterer sizing.
    • The method offers high accuracy in differentiating microsphere sizes.
    • Speckle noise reduction techniques improve the reliability and resolution of spectral analysis in OCT.